Feigin-Semikhatov duality at the critical level

Thomas Creutzig, Xuanzhong Dai, Bailin Song

The Feigin-Semikhatov duality asserts that the Heisenberg cosets of the subregular $W$-algebra of ${\mathfrak{sl}}_n$ at level $k$ and the one of the principal $W$-superalgebra of $\…